Adamant, Ardent, Assiduous, Bound, Ceaseless, Certain, Committed, Constant, Continual, Continuing, Continuous, Cruel, Decided, Decisive, Dedicated, Definite, Determined, Devoted, Diligent, Dogged, Dour, Earnest, Enduring, Energetic, Faithful, Fated, Fateful, Ferocious, Fervent, Fierce, Firm, Flinty, Fundamentalist, Grim, Habitual, Hard, Hardworking, Tenacious, Tireless, Tough, Unabated, Unaffected, Unalterable, Unavoidable, Unbending, Unbroken, Unceasing, Unchangeable, Uncompromising, Unconquerable, Uncontrollable, Undaunted, Unfailing, Unfeeling, Unflagging, Unflinching, Unforgiving, Uninterrupted, Unmoved, Unmoving, Unrelenting, Unrelieved, Unremitting, Unstoppable, Unswerving, Unsympathetic, Untiring, Unwavering, Unwearied, Unyielding, Vehement, Wholehearted, Zealous, Harsh, Heartless, Hidebound, Immovable, Immutable, Implacable, Incessant, Inclement, Indefatigable, Indefeasible, Indomitable, Industrious, Inelastic, Ineluctable, Inescapable, Inevitable, Inexorable, Inflexible, Inhuman, Insistent, Intractable, Intransigent, Invincible, Iron, Irreconcilable, Irresistible, Irrevocable, Laborious, Lasting, Loyal, Merciless, Mortal, Necessary, Obdurate, Obstinate, Orthodox, Patient, Permanent, Perpetual, Persevering, Persistent, Persisting, Pertinacious, Pitiless, Plodding, Plugging, Preoccupied, Purist, Puritan, Purposeful, Rapt, Regular, Remorseless, Resolute, Resolved, Rigid, Rigorous, Ruthless, Serious, Sincere, Sleepless, Slogging, Stable, Steadfast, Steady, Steely, Stern, Stiff, Strenuous, Strict, Stringent, Stubborn, Sure
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